Encontrados 7 documentos, a visualizar página 1 de 1
Reproductive parameters of tropical lesser noddies respond to local variations ...
Monticelli, David; Ramos, J. A.; Catry, Teresa; Pedro, Patricia; Paiva, Vitor H.Most attempts to link seabirds and climate/oceanographic effects have concerned the Atlantic and Pacific Oceans with comparatively few studies in the tropical Indian Ocean. This paper examines the reproductive response of the lesser noddy Anous tenuirostris to temporal fluctuations in oceanographic and climatic conditions using 8 years of monitoring data from Aride Island (Seychelles), tropical Western Indian O...
Polar marine biology science in Portugal and Spain: Recent advances and future ...
Xavier, José C.; Barbosa, Andrés; Agustí, Susana; Alonso-Sáez, Laura; Alvito, Pedro; Ameneiro, Julia; Ávila, Conxita; Baeta, Alexandra; Canário, JoãoPolar marine ecosystems have global ecological and economic importance because of their unique biodiversity and their major role in climate processes and commercial fisheries, among others. Portugal and Spain have been highly active in a wide range of disciplines in marine biology of the Antarctic and the Arctic. The main aim of this paper is to provide a synopsis of some of the results and initiatives undertak...
Past and present trophic position and decadal changes in diet of Yellow-legged ...
Pedro, Patricia I.; Ramos, J. A.; Neves, Verónica C.; Paiva, Vitor H.This study evaluates the trophic position of adult Yellow-legged Gulls Larus michahellis atlantis resident in the Azores archipelago in the past (1921–1928) and in the present (2009–2010), and analyses the decadal variation in the diet of breeding birds from the 1990s to the 2000s for three main colonies (Topo Islet, Baixo Islet and Mistério da Prainha). Using mixing models, we compared stable isotope signature...
Relation between climatic factors, diet and reproductive parameters of Little T...
Ramos, J. A.; Pedro, Patricia; Matos, Antonio; Paiva, Vitor H.We used 10 years of data on clutch size, egg size and diet, and 8 years of data on timing of laying on Little Terns (Sternula albifrons) breeding in Ria Formosa lagoon system, Algarve, Portugal to assess whether diet acts as an important intermediary between climatic conditions and breeding parameters. We used Generalized Linear Models to relate (1) the relative occurrence and size of the main prey species, san...
Foraging habitat selection by Little Terns Sternula albifrons in an estuarine l...
Paiva, Vitor H.; Ramos, Jaime A.; Martins, Jorge; Almeida, Ana; Carvalho, AnaWe assessed the effects of environmental variables on the distribution and feeding behaviour of adult Little Terns Sternula albifrons in Ria Formosa Natural Park, Algarve, southern Portugal, in different foraging habitats (main lagoon, salinas and sea) during the breeding seasons, April2013July, of 2003201305. Foraging density was higher in the lagoon than in the sea, and at low tide. The number of foraging ind...
The Influence of Diet on Mercury Intake by Little Tern Chicks
Paiva, Vitor H.; Tavares, Paula C.; Ramos, Jaime A.; Pereira, Eduarda; Antunes, Sandra; Duarte, Armando C.We assessed mercury levels in the feathers of little tern (Sternula albifrons) chicks from hatching to fledging and in their prey captured by adults in three main foraging habitats: lagoon, salinas, and adjacent sea. These data were used to model mercury concentration in chick feathers through food ingestion, in order to explore the effects that changes in diet would have on the mercury burden of chicks as they...
Importance of marine prey to growth of estuarine tern chicks: evidence from an ...
Paiva, Vitor H.; Ramos, Jaime A.; Machado, Daniel; Penha-Lopes, Gil; Bouslama, Mohamed Fadhel; Dias, Nuno; Nielsen, SørenWe assessed the effects of quality and quantity of prey species on the growth of Little Tern Sterna albifrons chicks raised in salinas (salt-pans), Algarve, Portugal. An energetic balance model was developed, which estimated the total amount of energy ingested by all chicks in a nest and the energy expenditure by the chicks when either growing alone or in groups of two and three per nest. Energy intake per chic...
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